Taxonomy: Kingdom - Plantae (plants). Subkingdom - Tracheobionta (vascular plants). Division - Pteridophyta (Ferns). Class - Filicopsida. Order - Polypodiales. Family - PDryopteridaceae (Wood Fern Family). Genus -Athyrium Roth. Species - Athyrium filix-femina (L.) Roth - common ladyfern.
General: Highly variable in appearance over its range, Subarctic lady fern is typically a large, clustered fern, 2-3 ft. tall. Its light-green color and twice-pinnate fronds with finely toothed leaflets create the illusion of a dainty fern, despite its large size. Stems are greenish-yellow to red.